Apparatus for operating reciprocating hydraulic motors.



No. 833,931. PATENTED OCT. 23, 1906.

- A. H. JOHNSON.

APPARATUS FOR OPERATING REOIPROOATING HYDRAULIC MOTORS.

APPLICATION FILED JUNE 2, 19 06- I 3 SHEETS- SHEET 1.

fin 80D) $391M, P 2 R Noi 833,931. PATENTED)OGT.Z3, 1906.

, A. H. JOHNSON.

APPARATUS FOR OPERATING RBGIPROGATING'HYDRAULIG MOTORS.

APPLIOATION FILED JUN 112.1906.

3 SHEETS SHEET 2.

BATENTED 0013.23, 1906.

. O A.-'H. JOHNSON. I I ,APPARATUSIFOR OPERATING REOLPROGATING HYDRAULIG MOTORS.

a sums-sum a.

APPLIOATIOH I'ILED JUNE 2,1906.

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[NVEZ/VTOR I Allorney v Fig.]5,of the rotary gear p,-F1gs. 1 and 5.

- UNITE STATES PATENT OFFICE."

ARTHUR HENRY. JOHNSON, OF BICKLEY, ENGLAND. I I I APPARA'II'IUS Fon OPERATING .RECIPBOCATING HIYDRAULYIIG MOTORS.

Specification of Letters Patent.

Application filed June 2, 1906. Serial No. 319,927.

- Patented Oct. 23, 1906.

To a/ll z vhom it may concern: I I

Be it'k'noim that I, ARTHUR HENRY JOHN- son, a subject of the Kin of Great Britain and Ireland, residing at Bic kley, in the county of Kent, England, (whose post-office address is -Winfrith, The Avenue, Bickley, Kent,

. En land) have invented certain new and use llmfprovements in and Relating to Apparatus or Operating Reciprocating I-Iydraulic Motors; and I do hereby declare the following to be a full, clear, and exact d'escription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object improvements in or relating to apparatus for operating or controlling railway switch-points, signa s, and the like; and it consistsinthe novel features of construction and combination of parts or devices hereinafter fully disclosed,

and more particularly pointed out in the" claims. I y

In the accompanying drawings, which illustrate a method of carrying out my inventio'n, Figure 1 shows my invention a plied for operating a pair of railway switc points. Fig. 2 is a sectional view of part of my apparatus, disclosing the by-pass and means for controlling the same, hereinafter described. Fig. 2 is a detail view of one of 'thesma'll ramshh, hereinafter referred to. Fig. 3 is anend elevation of the rollers b b and escapement-crank e employed in Fig. 1 and hereinafter described. -Fig. 4 is a sectional elevation of the chamber (1 and ram r, Fig. 5 is a view of the rotary gear for moving the liquid, as

hereinafter described. Fig. 6 is a dia rammatic .view of the electric circuits. hi 7 -is a ;s1m1lar'v1ewto Fig. 6, but shows a valvemagn'et arranged v1n series with the motor,-

[ armature. Fig. 8 is a vertical section show- Referring tot ing a modified arrangement of valve mechanism for controlling the by-pass. Fig. 9 is a plan viewof the parts shown in Fig. 8.

e drawings, e, Fig. ,1, represents the well-known lock-bar, the bolt for looking the switch-points being omitted.

is an electric motor, the spindle of which is coupled by coupling 7 to the spindle p,

l "cand dare connected through the medium of the pipes lcand land the gear 1). The

chambers c and d, the ipes k and l, and the ear-chamber are fille with a liquids'uch, or instance, as a mineral oil. When the motor-spindle rotates, the gear-wheels are revolve and liquid is taken from one ramplacing the ram 1. I When the rotation of the electric motor-spindle is reversed, the ram 1' is displaced in the opposite direction.

chamber and forced into the other, thus disb is a roller carried by a pin 12, passing through the ram. The roller b (shown at Fig. 3) is carried by the same'pin. Each of these rollers b b engageswith an arm of an escapement-cr'an'k e, mounted on the pin- I plate a. .The switch-points are connected to' the escapement-crank, as shown. On a complete movement of the ram in either one pass has openin s u an 0, Fig. 1, in a valveseat of a conical valve f, Fig. 2. When the valve f is held down on its seat by the armajture 2; being attracted to the electromagnet -cores o and n, no liquid can circulate by means of the byass; but when magnets on are demagnetize the-valve f is forced from its seat upon working the motor m; which is thus allowed to run on, although ram r is obstructed or has come to the end of its stroke. I I

In Fig. 2 is shown a detail of asmall ram h,

two such ramsbeing shown in ositionat h h,

Fig. "2. It will be seen that t e barrels into 'which they are inserted communicate with the by-pass' The spring, sis supported in anyapproved manner in then per part of the box -y, and in Figs. 8 and 9 brackets 50 ,are shown for holding the sprin in position. The

end ortions of thespring s ear downwardly on t e rams h h when the electric contacts 5 and 6 are closed, and the electromagnets o n being energized then hold down the armature 2. Now spring 8 is sufficiently strong to hold down eitherram h or h when subjected to the ordinary. working pressure of the li uid; but

should any obstruction cause an a normal ress ure to be formed in the chambers'c and the ram h or it. as'the case mav be. is forced The valve f is raised by the pressure of the fluidunder it when permitted to do so by the electromagnets or it may be raised by suitable lifting mechanism, if desired. When the valve is conical, a portion of the fluid escapes upward into the box y; but this is more advantageous than otherwise. i The esca ed fluid subsequently returns by gravity. en a cylindrical by-pass'valve is used, as shown in Fig. 8, it is desirable to provide reliefvalves f f to let a little fluld escape into the box 3 tacts s, s..

The electric circuits are shown at Fig. 6. z is an operating-lever for closing or opening the reversing-switch s s s. This switch is shown open tocorrespond with the position of the points, Fig. 1. To reverse the points, the lever z is moved over to the position 1 11, thus closing contacts 8 s. The battery or other electrical source k then sends a current via armature m, field 'm, contact s, and battery Is. At the same time a shunt-current circulates via valve-magnets on and contact i The armature then rotates in the div rection determined by the field m and as the valve is held closed by the magnets 0 n the ram is forced over as regards Fig. 1 from right to left, thus reversing the points.

, On reference to Fig. 1 it will be seen that leverre' is prolongedin order to open contact j at one end of its stroke and I1 at the other end. For the sake of clearness these contacts are shown workin in connection with lever e; .but they may be attached to box y and opened by a projection from rain 1. Contactst and are shown in the circuit-diagram, Fig. 6, an it will be seen that the effect of olpenin either'is' to demagnetize coils 0 n, t us re easing the by pass valve 7 and allowing the motor a free run while the operatingcontacts 8 sare closed. The motor is then stopped by moving the lever to position IIII,

thus 0' ening the circuit at s s.. To return the polnts to their normal position, lever z is placed in position II, thus closing switch-con- Current will then circulate as follows, viz: 7c, ,m, field-coil m, valve-magnets n 0,. battery It. The direction of the rotation of armature m is now reversed, owing to: field m being wound in opposition to m. The rotary gear is thus-driven in the op osite direction to that previously describe and the ram 1' is thus traversed from left to ri ht,

returning the points to their normal osition, as shown. An Important feature 0 the rota gear when used as shown and described is t at it does not depend upon its suction action as a pump, but acts on the liquid as a simple cog-wheel, for as fast as liquid is exelled in front of the cog-wheels it is fed in beind them by the action of ram 1'.

In Fig. 6 the valve-magnets 0 n are shown shunted across the motor-wires; but it is obvious that their windings might be in series with the motor-armature, and a circuit for accomplishing this is shown at Fig. 7, like parts bearing the same letters of reference.

Instead of employing either series or shunt windings 0 n by themselves I may use a compound windin partly series and partly shunt. The s unt-winding will oppose a series winding in the well-known way. The object of this is to weaken the force of magnets 0 n when the current through the motor rises.

The rotary wheels p and their casing constitute one form of reversible rotary pump, and the rams r, with their cylinders and connections, constitute a double-acting reciprocatory engine, which is driven in one direction or the other by the pressure of the fluid forced into it by the said pump. This en ine affords a means for moving a points-r0 a signal-rod, or other similar device back and forth at will.

In order to clearly illustrate the action of the by-pass valve f and to show that its ac can pass out into the chamber y. Expansion and. contraction of the liquid in the ramchambers and pipes take place via valves f f which are adapted to-fly u and close their ports when pressure is app ied to the liquid by means of the rotary gear.

What I claim, and desire to secure byLetters Patent, is-

1. The combination, with a casin and intergearing toothed wheels journalecI therein; of a reversible motor for driving the said wheels, two cylinders, a piston having its end portions slidable in the said cylinders, (pipes connecting the opposite ends of the sai cylinders with the opposite sides of the said casing respectively, a bypass connecting the opposite ends of the said cylinders, a valve controlling the said by-pass, an electromagnet normally holding the said valve closed, and means for dee-nergizing the said electromagnet at will.

2. The combination, with a casin and ii1- tergearing toothed wheels journaledtherein mg respectively, a byassconnccting the net and actuated by the said rams when the 10 1 opposite ends of' the' said cylinders, a valve controlling the said by-pass, two barrels communicating with the end portions of the said by-pass, two rams slidable in the said barrels, a spring -normall preventing the said rams from slidin an e ectromagnet normally holding' the sak valve closed, andelectric contact mechanism controlling the said electromagpressure in the said cylinders becomes ex- -cess1ve.

In testimony whereofI affix my signature in presence of two witnesses. v

f ARTHUR HENRY JOHNSON.

Witnesses: V D. H. TINSON, H. P. SCOTT. 

